Really strange noise while driving

Unfortunately, I believe this differential has served its time.

I think the oil got really hot due to the broken gears and just until it was solid. That's my best guess. I don't see any signs of leaking anywhere, although the rear obviously gets dirtier than the front
Not sure on that, think the front would work more...i did see a great video on the Mazda awd operation-maybe i can find again...i found the front dirty and rear clean on mine at around 27k.
 
Ouch, sorry to see that @Tland4. Been there, done that.. though in my case, there was plenty of fluid, but it was thick with grey and silver particles, and I had just as many metal chunks. Hope you can get this squared away without having to spend too much!

Also, if you've lost rear wheel engagement, be careful accelerating in wet/slippery conditions. The traction control might be too restrictive and force you to limp when you want the car to jump - especially scary when you try to accelerate to merge onto a busy roadway.
 
Not sure on that, think the front would work more...i did see a great video on the Mazda awd operation-maybe i can find again...i found the front dirty and rear clean on mine at around 27k.
I'm sure the front works harder. I meant that the rear gets dirtier due to not being covered like the front diff is. So if it was leaking, it would've been hard to find.

There were never any signs while the car was parked in the garage.
 
Ouch, sorry to see that @Tland4. Been there, done that.. though in my case, there was plenty of fluid, but it was thick with grey and silver particles, and I had just as many metal chunks. Hope you can get this squared away without having to spend too much!

Also, if you've lost rear wheel engagement, be careful accelerating in wet/slippery conditions. The traction control might be too restrictive and force you to limp when you want the car to jump - especially scary when you try to accelerate to merge onto a busy roadway.
Found a new rear diff on eBay from a reputable seller for about $1k. Not money I wanted to spend, but could be worse. The car is paid off, and otherwise runs flawlessly, so it's a no-brainer to fix it.

I'm just hoping the dealer will still program it since they're not doing the install.
 

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